Air-over-hydraulic air boosting pump of loader

Abstract

The invention discloses an air-over-hydraulic air boosting pump of a loader. The air boosting pump comprises an air chamber and a hydraulic cylinder. An air piston in the air chamber adopts a diaphragm (4) which is connected with a hydraulic piston assembly (19) in the hydraulic cylinder through a push rod (27). By means of the technical scheme, by improvement of the structure of the air chamber cavity and the diaphragm is adopted to replace an air piston leather collar, air leakage due to abrasion of the prior air piston leather collar after long-time work is prevented, and air leakage cannot be caused even if the dust-proof effect of a respirator is poor, so that the product reliability is improved; the direction of the surface of a rubber seal is changed, front impact of high-pressure oil on the seal rubber is prevented, and accordingly the service life of the product is prolonged; a support ring is added, and a Y-shaped ring can be prevented from falling off and being abraded, so that the product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of construction machinery brake systems. More specifically, the present invention relates to a gas-top-liquid-air booster pump for a loader. Background technique [0002] The air chamber cavity of the traditional air booster pump is composed of the cylinder body assembly, the push rod piston assembly, the respirator assembly and the connecting cover. When working, the push rod piston assembly is pushed by the air pressure at the air outlet of the air brake valve. The push rod pushes the hydraulic live assembly to realize hydraulic braking. [0003] The problem that prior art exists is: [0004] 1. The air piston apron on the push rod-piston assembly rubs against the inner surface of the cylinder for a long time, which will cause the cutting edge of the air piston apron to wear out, and the respirator will not be able to completely work for a long time under severe working conditions. Prevent dust and fore...

AI Technical Summary

Problems solved by technology

[0004] 1. The air piston apron on the push rod-piston assembly rubs against the inner surface of the cylinder for a long time, which will cause the cutting edge of the air piston apron to wear out, and the respirator will not be able to completely work for a long time under severe working conditions. Prevent dust and foreign matter from entering the cylinder block, which has a great impact on the durability of the afterburner pump;

[0005] 2. The Y-shaped ring on the connection cover has no fixing device, and it is easy to fall off after a long time working, which has a great impact on the durability of the afterburner pump.

[0006] 3. The push rod seat of the hydraulic chamber of the air booster pump is positively sealed. When the product returns to its position, the high-pressure oil in the pipeline impacts the rubber on the push rod seat and causes damage, resulting in seal failure and brake failure.

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